Hi,
You will need to code the PHP which generates the menu from scratch to do that. I offer this as part of the ‘[url=http://]Premium Membership[/url]’ option, but it is too time consuming to do for everone sorry.
https://geek.hellyer.kiwi/premium_support/
If you have a hunt through some of the older forum topics on here, you will find instructions on how to modify the plugins behaviour in this way. The instructions you will find were for features which weren’t part of the plugin previously but are now. However the principle still applies and you can use these techniques to add a third set of custom menu options.